. >>> right now, president obama and mitt romney are campaigning after the first presidential debate. the president is holding a rally in denver before heading to the university of wisconsin in madison. romney is with paul ryan in virginia. >>> national park service crews are working to solve an algae problem at the reflecting pool. tony tull is by the pool where they are dealing with quite the clean up there. tony? >> reporter: they are. good morning. the national park service said they were going to drain and clean the reflecting pool, everybody thought it wasn't going to be a big deal. look over my shoulder. over 100 workers using hoses, shovels, brooms and high powered vacuums to get t algae out of there. it's a bigger problem than anybody anticipated. >> it's slippery when you walk on it. it sticks to the bottom of the shovel. >> it's the last thing they wanted to do after the republican novation to the reflecting pool, tack on another $100,000 service to the invoice. >> it's frustrating to the national parks service. we did not expect to have to do it so quickly. this is a maint